#include <llvm/IR/LLVMContext.h>
#include <llvm/IR/Module.h>
#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/Verifier.h>
#include <llvm/Passes/PassBuilder.h>
#include <llvm/Passes/PassPlugin.h>
#include <llvm/Transforms/Scalar/LoopUnrollPass.h>
#include <llvm/IR/IRPrintingPasses.h>
#include <llvm/Support/raw_ostream.h>
#include <llvm/Support/TargetSelect.h>
#include <llvm/Support/FileSystem.h>
#include <llvm/IR/PassManager.h>

using namespace llvm;

int main(int argc, char *argv[]) {
    if (argc < 2) {
        errs() << "Usage: " << argv[0] << " <IR file>\n";
        return 1;
    }

    LLVMContext context;
    SMDiagnostic error;
    std::unique_ptr<Module> module = parseIRFile(argv[1], error, context);
    if (!module) {
        errs() << "Error reading IR file\n";
        return 1;
    }

    PassBuilder passBuilder;
    LoopUnrollPass::Options options;
    passBuilder.registerLoopAnalyses([](Function &F, LoopAnalysisManager &LAM, LoopStandardAnalysisResults &LSAR, LPMUpdater &Updater) {});
    FunctionAnalysisManager fam;
    passBuilder.registerFunctionAnalyses(fam);
    LoopAnalysisManager lam;
    passBuilder.registerLoopAnalyses(lam);
    passBuilder.buildLoopUnrollPass(options);
    PassManager<Module> passManager;
    AnalysisManager<Module> am;
    passManager.run(*module, am);

    // Write the optimized LLVM IR to a file
    std::error_code EC;
    raw_fd_ostream outputFile("optimized.ll", EC, sys::fs::OF_None);
    if (!EC) {
        module->print(outputFile, nullptr);
    } else {
        errs() << "Error opening file for writing: " << EC.message() << "\n";
    }

    return 0;
}
